sqlalchemy.dialects.postgresql.base PGIdentifierPreparer Example Code

PGIdentifierPreparer is a class within the sqlalchemy.dialects.postgresql.base module of the SQLAlchemy project.

PGCompiler and PGTypeCompiler are a couple of other callables within the sqlalchemy.dialects.postgresql.base package that also have code examples.

Example 1 from sqlalchemy-clickhouse

sqlalchemy-clickhouse is a SQLAlchemy Dialect for communicating with the open source ClickHouse database management system. ClickHouse is column-oriented and therefore better for some use cases and worse for others compared to a traditional relational database.

The code for this project is open sourced under the MIT license while ClickHouse is provided as open source under the Apache License 2.0.

sqlalchemy-clickhouse / base.py

# base.py

import re

import sqlalchemy.types as sqltypes
from sqlalchemy import exc as sa_exc
from sqlalchemy import util as sa_util
from sqlalchemy.engine import default, reflection
from sqlalchemy.sql import compiler, expression
from sqlalchemy.sql.elements import quoted_name
from sqlalchemy.dialects.postgresql.base import PGCompiler, PGIdentifierPreparer
from sqlalchemy.types import (
    CHAR, DATE, DATETIME, INTEGER, SMALLINT, BIGINT, DECIMAL, TIME,
    TIMESTAMP, VARCHAR, BINARY, BOOLEAN, FLOAT, REAL)

VERSION = (0, 1, 0, None)

colspecs = {}

class ARRAY(sqltypes.TypeEngine):
    __visit_name__ = 'ARRAY'

ischema_names = {
    'Int64': INTEGER,
    'Int32': INTEGER,
    'Int16': INTEGER,
    'Int8': INTEGER,
    'UInt64': INTEGER,
    'UInt32': INTEGER,
    'UInt16': INTEGER,
    'UInt8': INTEGER,
    'Date': DATE,
    'DateTime': DATETIME,
    'Float64': FLOAT,
    'Float32': FLOAT,
    'String': VARCHAR,
    'FixedString': VARCHAR,
    'Enum': VARCHAR,
    'Enum8': VARCHAR,
    'Enum16': VARCHAR,
    'Array': ARRAY,
}

class ClickHouseIdentifierPreparer(PGIdentifierPreparer):
    def quote_identifier(self, value):
        return self._escape_identifier(value)
    def quote(self, ident, force=None):
        if self._requires_quotes(ident):
            return '"{}"'.format(ident)
        return ident

class ClickHouseCompiler(PGCompiler):
    def visit_count_func(self, fn, **kw):
        return 'count{0}'.format(self.process(fn.clause_expr, **kw))

    def visit_random_func(self, fn, **kw):
        return 'rand()'

    def visit_now_func(self, fn, **kw):
        return 'now()'

    def visit_current_date_func(self, fn, **kw):
        return 'today()'

    def visit_true(self, element, **kw):
        return '1'

    def visit_false(self, element, **kw):


## ... source file continues with no further PGIdentifierPreparer examples...

Sponsored By

Sentry logo

Software errors are inevitable. Chaos is not. Try Sentry for free.


AssemblyAI logo

The most accurate speech-to-text API. Built for Python developers.

1. Introduction 2. Development Environments 3. Data 4. Web Development 5. Deployment 6. DevOps Changelog What Full Stack Means About the Author Future Directions Page Statuses SQLAlchemy ExtensionsSQLAlchemy Example CodeSQLAlchemy Modelssqlalchemy.databases mysqlsqlalchemy.dialects mssqlsqlalchemy.dialects mysqlsqlalchemy.dialects oraclesqlalchemy.schema DDLsqlalchemy.dialects postgresqlsqlalchemy.sql.expression Functionsqlalchemy.dialects sqlitesqlalchemy.dialects.mysql pymysqlsqlalchemy.dialects.postgresql ARRAYsqlalchemy.dialects.postgresql BIGINTsqlalchemy.dialects.postgresql BITsqlalchemy.dialects.postgresql DOUBLE_PRECISIONsqlalchemy.dialects.postgresql ExcludeConstraintsqlalchemy.dialects.postgresql INTEGERsqlalchemy.dialects.postgresql JSONsqlalchemy.dialects.postgresql TSVECTORsqlalchemy.dialects.postgresql pypostgresqlsqlalchemy.dialects.postgresql.base PGCompilersqlalchemy.dialects.postgresql.base PGIdentifierPreparersqlalchemy.dialects.postgresql.base PGTypeCompilersqlalchemy.dialects.postgresql.psycopg2 PGDialect_psycopg2sqlalchemy.dialects.sqlite pysqlitesqlalchemy.engine Connectionsqlalchemy.engine Enginesqlalchemy.engine create_enginesqlalchemy.engine defaultsqlalchemy.engine urlsqlalchemy.engine.default DefaultDialectsqlalchemy.engine.interfaces ExecutionContextsqlalchemy.engine.result ResultMetaDatasqlalchemy.engine.result RowProxysqlalchemy.engine.strategies EngineStrategysqlalchemy.engine.strategies MockEngineStrategysqlalchemy.engine.url make_urlsqlalchemy.events SchemaEventTargetsqlalchemy.exc ArgumentErrorsqlalchemy.exc DataErrorsqlalchemy.exc DatabaseErrorsqlalchemy.exc IntegrityErrorsqlalchemy.exc InvalidRequestErrorsqlalchemy.exc NoInspectionAvailablesqlalchemy.exc NoSuchTableErrorsqlalchemy.exc OperationalErrorsqlalchemy.exc ProgrammingErrorsqlalchemy.exc UnsupportedCompilationErrorsqlalchemy.ext compilersqlalchemy.ext.associationproxy AssociationProxysqlalchemy.ext.automap automap_basesqlalchemy.ext.compiler compilessqlalchemy.ext.declarative DeclarativeMetasqlalchemy.ext.declarative declarative_basesqlalchemy.ext.hybrid hybrid_methodsqlalchemy.ext.hybrid hybrid_propertysqlalchemy.ext.mutable Mutablesqlalchemy.inspection inspectsqlalchemy.orm ColumnPropertysqlalchemy.orm CompositePropertysqlalchemy.orm Loadsqlalchemy.orm Querysqlalchemy.orm RelationshipPropertysqlalchemy.orm SynonymPropertysqlalchemy.orm aliasedsqlalchemy.orm attributessqlalchemy.orm backrefsqlalchemy.orm class_mappersqlalchemy.orm column_propertysqlalchemy.orm compositesqlalchemy.orm interfacessqlalchemy.orm mappersqlalchemy.orm mapperlibsqlalchemy.orm object_mappersqlalchemy.orm object_sessionsqlalchemy.orm relationshipsqlalchemy.orm sessionsqlalchemy.orm sessionmakersqlalchemy.orm strategiessqlalchemy.orm.attributes InstrumentedAttributesqlalchemy.orm.attributes QueryableAttributesqlalchemy.orm.attributes flag_modifiedsqlalchemy.orm.collections InstrumentedListsqlalchemy.orm.exc NoResultFoundsqlalchemy.orm.exc UnmappedClassErrorsqlalchemy.orm.exc UnmappedInstanceErrorsqlalchemy.orm.interfaces MapperPropertysqlalchemy.orm.interfaces PropComparatorsqlalchemy.orm.mapper Mappersqlalchemy.orm.properties ColumnPropertysqlalchemy.orm.properties RelationshipPropertysqlalchemy.orm.query Querysqlalchemy.orm.query QueryContextsqlalchemy.orm.relationships RelationshipPropertysqlalchemy.orm.session Sessionsqlalchemy.orm.session object_sessionsqlalchemy.orm.util AliasedClasssqlalchemy.orm.util AliasedInspsqlalchemy.orm.util identity_keysqlalchemy.pool NullPoolsqlalchemy.pool StaticPoolsqlalchemy.schema CheckConstraintsqlalchemy.schema Columnsqlalchemy.schema CreateIndexsqlalchemy.schema CreateTablesqlalchemy.schema DDLElementsqlalchemy.schema ForeignKeysqlalchemy.schema ForeignKeyConstraintsqlalchemy.schema Indexsqlalchemy.schema PrimaryKeyConstraintsqlalchemy.schema Tablesqlalchemy.sql ClauseElementsqlalchemy.sql columnsqlalchemy.sql expressionsqlalchemy.sql extractsqlalchemy.sql functionssqlalchemy.sql operatorssqlalchemy.sql schemasqlalchemy.sql selectsqlalchemy.sql sqltypessqlalchemy.sql tablesqlalchemy.sql.compiler SQLCompilersqlalchemy.sql.elements ColumnElementsqlalchemy.sql.elements Labelsqlalchemy.sql.expression ClauseElementsqlalchemy.sql.expression ColumnClausesqlalchemy.sql.expression ColumnElementsqlalchemy.sql.expression Executablesqlalchemy.sql.expression FunctionElementsqlalchemy.sql.expression UnaryExpressionsqlalchemy.sql.functions FunctionElementsqlalchemy.sql.functions GenericFunctionsqlalchemy.sql.naming convsqlalchemy.sql.schema Columnsqlalchemy.sql.schema SchemaItemsqlalchemy.sql.sqltypes NullTypesqlalchemy.sql.util ClauseAdaptersqlalchemy.sql.visitors traversesqlalchemy.types Booleansqlalchemy.types Datesqlalchemy.types DateTimesqlalchemy.types Enumsqlalchemy.types Floatsqlalchemy.types Integersqlalchemy.types Intervalsqlalchemy.types NULLTYPEsqlalchemy.types Stringsqlalchemy.types Textsqlalchemy.types Timesqlalchemy.types TypeEnginesqlalchemy.types UserDefinedTypesqlalchemy.types to_instancesqlalchemy.util OrderedDictsqlalchemy.util OrderedSetsqlalchemy.util set_creation_ordersqlalchemy.util symbolsqlalchemy.util topologicalsqlalchemy.util.langhelpers public_factorysqlalchemy.util.langhelpers symbol ...or view the full table of contents.

Full Stack Python

Full Stack Python is an open book that explains concepts in plain language and provides helpful resources for those topics.
Updates via Twitter & Facebook.

Matt Makai 2012-2020